I already tried the following: "download-only" the composer package and installed it without deps. Unfortunately it doesn't work, as the composer is looking for files in standard php path:

# composer --help
PHP Warning: require_once(/usr/share/php/Symfony/Component/ClassLoader/ClassLoader.php): failed to open stream: No such file or directory in /usr/share/php/Composer/autoload.php on line 8
PHP Fatal error: require_once(): Failed opening required '/usr/share/php/Symfony/Component/ClassLoader/ClassLoader.php' (include_path='.:/opt/rh/rh-php56/root/usr/share/pear:/opt/rh/rh-php56/root/usr/share/php') in /usr/share/php/Composer/autoload.php on line 8

I enabled the current PHP RHSCL version like this:

ln -s /opt/rh/rh-php56/enable /etc/profile.d/rh-php56.sh

I prefere not to install all the dependencies... So is there a way to do so, and also get the composer working? Create another soft link int the /usr/share/php/ dir?